Phosphoric Acid → N-(2-Amino-4,6-dichloropyrimidin-5-yl)formamide

Participants

Reaction Conditions

Reaction Steps

A slurry of 2-amino-4,6-dichloro-5-{[(dimethylamino)methylene]amino}pyrimidine (Example 2, 1.50 g, 6.41 mmol) and 1.5 M aqueous potassium phosphate buffer (35 mL, prepared by adjusting the pH of a 1.5 M solution of KH2PO4 to 3.2 by addition of 85% phosphoric acid) was gently refluxed (in an oil bath at 125° C.). After 4 hours of reflux, the pH of the mixture was adjusted from 4 to 3 by addition of 4 drops of 85% phosphoric acid. After a total of 6 hours of reflux, TLC(silica gel plates developed in 5% methanol-chloroform) showed that the starting material had been largely converted to a lower-Rf product. The solid was filtered and washed with water (5 mL), methanol (5 mL), and dried to give the title compound as a white solid (0.900 g, 68%), m.p. >250° C. dec.; mass spectrum (CI/CH4): 209, 207 (M+1); 1H-NMR (DMSO-d6)δ: 9.81 and 9.46 (s and d, J=11 Hz, total 1, NH), 8.25 and 8.00 (s and d, J=11 Hz, total 1, CHO), 7.69 and 7.63 (both s, total 2, NH2).

Provenance & Evidence